Ihe arụrụ arụ nke cellulose ether gbanwetụrụ maka ụrọ ciment

Ngwa ngwa ciment a gbanwere nke nwere oke ciment nke 0.45, nha lime-aja nke 1: 2.5, na cellulose ether nwere viscosities dị iche iche nke 0%, 0.2%, 0.4%, 0.6%, 0.8%, na 1.0% kwadebere. .Site n'ịtụle ihe arụrụ arụ nke ụrọ ciment na ileba anya na morphology microscopic, mmetụta nke HEMC na ike mkpakọ, ike mgbanwe na ike njikọ nke ngwa ngwa ciment gbanwere.Nsonaazụ nyocha na-egosi na: na mmụba nke ọdịnaya HEMC, ike mkpakọ nke ngwa agha gbanwere na afọ dị iche iche na-ebelata mgbe niile, na mbelata oke na-ebelata ma na-achọ ịdị nwayọọ;mgbe agbakwunyere otu ọdịnaya nke cellulose ether, ike mkpakọ nke cellulose ether modified mortar nwere viscosities dị iche iche bụ: HEMC20HEMC10>HEMC5.

Isi okwu:cellulose ether;ngwa simenti;ike mkpakọ;ike mgbanwe;ike nkekọ

1 Okwu mmalite

N'oge a, ihe a na-achọ ngwa agha kwa afọ n'ụwa karịrị nde 200, na ọchịchọ ụlọ ọrụ ka na-arị elu.Ka ọ dị ugbu a, ngwa ngwa ciment ọdịnala nwere ntụpọ dị ka ọbara ọgbụgba, delamination, nnukwu nkụchi nke nkụchi, adịghị ike na-adịghị mma, ike njigide dị ala, na hydration na-ezughị ezu n'ihi ụkọ mmiri, nke siri ike idozi, ọ bụghị naanị na-akpata mmebi ihe owuwu, kamakwa na-eduga. ime ka ihe siri ike dị ka mgbawa ngwa agha, ịhịa aka n'ahụ, ịwụfu na oghere na-eme.

Dị ka otu n'ime admixtures a na-ejikarị eme ihe maka ngwa agha azụmahịa, cellulose ether nwere ọrụ nke njide mmiri, ịgbatị na nkwụsịtụ, a pụkwara iji ya mee ka ihe anụ ahụ nke ciment mortar dị ka ịrụ ọrụ, njide mmiri, ịrụ ọrụ nke ọma, na ịtọ oge. , dị ka ciment na-abawanye nke ukwuu.A ga-ebelata ike njigide njide nke ngwa agha, mana ike mkpakọ, ike mgbanwe na modul nke ngwa ngwa ciment ga-ebelata.Zhang Yishun na ndị ọzọ mụrụ mmetụta methyl cellulose ether na hydroxypropyl methyl cellulose ether na Njirimara nke ngwa agha.Nsonaazụ gosiri na: ma cellulose ethers nwere ike melite mmiri njigide nke ngwa agha, na flexural ike na The compressive ike ibelata dị iche iche degrees, mgbe mpịachi ruru na bonding ike nke ngwa agha abawanye na dị iche iche degrees, na shrinkage arụmọrụ nke ngwa agha nwere ike. ka mma.AJenni, R.Zurbriggen, wdg na-eji oge a ule na nyocha usoro na-amụ mmekọrịta nke dị iche iche ihe na cellulose ether gbanwetụrụ mkpa-Layer nrapado ngwa agha usoro, na hụrụ na cellulose ether na Ca (OH) pụtara nso elu nke ngwa agha. .2, na-egosi mbugharị nke cellulose ethers na ihe ndị sitere na ciment.

N'ime akwụkwọ a, na-eji usoro nyocha ngwa agha dị ka mgbochi mkpakọ, nkwụsi ike mgbanwe, njikọ, na ọdịdị SEM microscopic, mmetụta nke cellulose ether cement mortar na-arụ ọrụ dị ka ike mkpakọ, nguzogide mgbanwe, na ike njikọ na afọ dị iche iche na-amụ. ma a kọwawo ya.usoro nke omume ya.

2. Ngwa ngwa na ụzọ ule

2.1 Akụrụngwa

2.1.1 Simenti

ciment laurate nkịtị nke Wuhan Huaxin Cement Co., Ltd mepụtara, ụdị P 042.5 (GB175-2007), nwere njupụta nke 3.25g/cm³ na ebe a kapịrị ọnụ nke 4200cm²/g.

2.1.2 Hydroxypropyl methylcellulose ether

Nkehydroxyethyl methyl cellulose etherNdị Hercules Group nke United States mepụtara nwere viscosities nke 50000MPa/s, 100000MPa/s, na 200000MPa/s na 2% ngwọta na 25°C, na ndebiri ndebiri ndị a bụ HEMC5, HEMC10, na HEMC20.

2.2 Usoro ule

a.Ike mkpakọ nke ngwa agha gbanwetụrụ

A nwalere ike mkpakọ nke ụdị ndụ ndụ akwụkwọ ndụ na igwe TYE-300 compressive ike sitere na Wuxi Jianyi Instrument Co., Ltd. Ọnụego ntinye bụ 0.5 kN/s.A na-eme ule ike mkpakọ dịka GB/T17671-1999 "Ụzọ Nnwale Simenti Mortar Strength Test (ISO Method)".

Site na nkọwapụta, usoro maka ịgbakọ ike mkpakọ nke ahụ ndụ ndụ ndụ bụ:

Rc=F/S

Ebe Rc-ike mkpakọ, MPa;

F-ibu ọdịda na-arụ ọrụ n'ụdị, kN;

S-mpaghara nrụgide, m².

Site na nkọwapụta, usoro maka ịgbakọ ike mgbanwe nke ahụ ndụ ndụ ndụ bụ:

Rf= (3P× L)/(2b× h²) =0.234×P

Na usoro, Rf-ike mgbanwe, MPa;

P-ibu ọdịda na-arụ ọrụ n'ụdị, kN;

L-ebe dị anya n'etiti etiti ndị na-akwado cylinders, ya bụ, 10cm;

b, h-obosara na ịdị elu nke cross-ngalaba nke ule ahụ, nke abụọ bụ 4cm.

b.Ike njigide agbatị nke ngwa ngwa ciment gbanwetụrụ

Jiri ZQS6-2000 Adhesive Brick Adhesive Adhesive Strength Detector iji tụọ ike nrapado na ọsọ ọsọ bụ 2mm/min.Emere ule ike nke njikọ dị ka JC/T985-2005 si kwuo "mmadụ na-edozi onwe ya na-adabere na ciment maka ala".

Site na nkọwapụta, usoro maka ịgbakọ ike njikọ nke ahụ ndụ ndụ bụ:

P=F/S

N'ime usoro, P-ike njikọ nke ntachi, MPa;

F-oke ọdịda ọdịda, N;

S-ebe njikọ, mm².

3. Nsonaazụ na mkparịta ụka

3.1 ike mkpakọ

Site na ike mkpakọ nke ụdị abụọ cellulose ether modified motars nwere viscosities dị iche iche na afọ dị iche iche, enwere ike ịhụ na mmụba nke ọdịnaya HEMC, ike mkpakọ nke cellulose ether modified mortars na afọ dị iche iche (3d, 7d na 28d) belatara. budata.Na-ebelata nke ọma ma jiri nwayọọ nwayọọ guzosie ike: mgbe ọdịnaya nke HEMC na-erughị 0.4%, ike mkpakọ na-ebelata nke ukwuu ma e jiri ya tụnyere ihe nlele efu;mgbe ọdịnaya nke HEMC bụ 0.4% ~ 1.0%, usoro nke ibelata ike mkpakọ na-ebelata.Mgbe ọdịnaya cellulose ether karịrị 0.8%, ike mkpakọ nke 7d na 28d afọ dị ala karịa nke oghere oghere na afọ 3d, ebe ike mkpakọ nke ngwa agha 3d gbanwere fọrọ nke nta ka ọ bụrụ efu, na ihe nlele ahụ bụ efu. Apịpịara ejighị ya kpọrọ nkụ Ngwa ngwa egwepịara ya, ime ya bụ ntụ ntụ, njupụta ya dịkwa obere.

Mmetụta nke otu HEMC na ike mkpakọ nke ngwa agha gbanwere na afọ dị iche iche dịkwa iche iche, na-egosi na ike mkpakọ nke 28d na-ebelata na mmụba nke ọdịnaya HEMC karịa nke 7d na 3d.Nke a na-egosi na mmetụta azụ azụ nke HEMC na-adị mgbe niile site na mmụba nke afọ, na mmetụta nkwụsị nke HEMC adịghị emetụta mbelata mmiri na usoro ma ọ bụ ọganihu nke mmeghachi omume hydration, na-eme ka ọganihu nke ike mkpakọ. nke ngwa agha gbanwetụrụ dị ntakịrị karịa nke ahụ na-enweghị ihe atụ Mortar agwakọta ya na HEMC.

Site na mgbanwe mgbanwe nke ike mkpakọ nke cellulose ether modified mortar na afọ dị iche iche, enwere ike ịhụ na mgbe agbakwunyere otu ego nke cellulose ether, ike mkpakọ nke cellulose ether gbanwetụrụ ngwa agha nwere viscosities dị iche iche bụ: HEMC20HEMC10>HEMC5.Nke a bụ n'ihi na HEMC nwere ogo dị elu nke polymerization na-enwe mmetụta dị ukwuu na mbelata ike mkpakọ nke ngwa agha karịa HEMC nwere obere polymerization, ma ike mkpakọ nke ngwa agha gbanwere na HEMC dị nnọọ ala karịa nke ahụ. ngwa agha oghere na-enweghị HEMC.

Ihe atọ ndị na-esonụ na-eduga ná mbelata nke mkpakọ ike nke ngwa agha gbanwetụrụ: n'otu aka ahụ, n'ihi na mmiri-soluble HEMC macromolecular netwọk Ọdịdị na-ekpuchi simenti irighiri, CSH gel, calcium oxide, calcium aluminate hydrate na ndị ọzọ ahụ na unhydrated. irighiri ihe N'elu, ọkachasị n'oge mmalite nke hydration ciment, mgbasa ozi n'etiti calcium aluminate hydrate na HEMC na-ebelata mmeghachi omume hydration nke calcium aluminate, na-ebute mbelata dị ukwuu na ike mkpakọ.Mmetụta nkwụghachi azụ nke ngwa agha na-adịgide adịgide doro anya, nke na-egosi na mgbe ọdịnaya nke HEMC20 ruru 0.8% ~ 1%, ike 3d nke ihe nlele ngwa ngwa gbanwere bụ efu;N'aka nke ọzọ, hydrated HEMC ngwọta nwere elu viscosity, na N'oge ngwakọta nke ngwa agha ahụ, ọ nwere ike ịgwakọta ya na ikuku na-emepụta ọnụ ọgụgụ buru ibu nke ikuku ikuku, na-eme ka ọnụ ọgụgụ buru ibu nke voids na ngwa ngwa siri ike. , na ike mkpakọ nke ihe nlele na-ebelata na-aga n'ihu na mmụba nke ọdịnaya HEMC na mmụba nke ogo polymerization;Usoro ngwa agha na-abawanye naanị mgbanwe nke ngwa agha ma enweghị ike ịrụ ọrụ nke nkwado siri ike, ya mere a na-ebelata ike mkpakọ.

3.2 ike mgbanwe

Site na ike mgbanwe nke abụọ dị iche iche viscosity cellulose ether modified mortars na afọ dị iche iche, a pụrụ ịhụ na yiri mgbanwe nke compressive ike nke gbanwetụrụ ngwa agha, ike mgbanwe nke cellulose ether modified ngwa agha ji nwayọọ nwayọọ na-ebelata na-abawanye nke HEMC ọdịnaya .

Site na mgbanwe mgbanwe nke ike mgbanwe nke cellulose ether modified mortar na afọ dị iche iche, enwere ike ịhụ na mgbe ọdịnaya nke cellulose ether bụ otu ihe ahụ, ike mgbanwe nke HEMC20 modified mortar sample dị ntakịrị ala karịa nke HEMC10 modified mortar sample, mgbe mgbe ọdịnaya nke HEMC bụ 0.4% ~ 0.8%, 28d ike na-agbanwe agbanwe na-agbanwe akụkụ nke abụọ ahụ fọrọ nke nta ka ọ dakọọ.

Site na mgbanwe mgbanwe nke ike mgbanwe nke cellulose ether modified mortar na afọ dị iche iche, a pụkwara ịhụ na mgbanwe na ike mgbanwe nke ngwa agha gbanwere bụ: HEMC5.

3.3 Bond ike

Enwere ike ịhụ ya site na ngbanwe dị iche iche nke ike njikọ nke atọ cellulose ether modified mortars na afọ dị iche iche na ike njikọ nke ngwa agha a gbanwere na-abawanye na mmụba nke ọdịnaya HEMC ma jiri nwayọọ nwayọọ na-eguzosi ike.Site na ịgbatị afọ, ike nkekọ nke ngwa agha gbanwetụrụ gosikwara na-abawanye ụba.

Enwere ike ịhụ ya site na mgbanwe mgbanwe ike nke ụbọchị 28 nke cellulose ether modified motars na ike njikọ nke ngwa agha gbanwere na-abawanye na mmụba nke ọdịnaya HEMC, ma jiri nwayọọ nwayọọ na-eme ka ọ kwụsie ike.N'otu oge ahụ, na mmụba nke ogo polymerization nke cellulose ether, mgbanwe nke njikọ ike nke ngwa agha gbanwetụrụ bụ: HEMC20>HEMC10>HEMC5.

Nke a bụ n'ihi iwebata ọnụ ọgụgụ dị ukwuu nke pores n'ime ngwa agha a gbanwere nke nwere nnukwu ọdịnaya HEMC, na-eme ka mmụba nke porosity nke anụ ahụ siri ike, mbelata nke njupụta nke ihe owuwu ahụ, na ngwa ngwa na-eto eto nke ike njikọ. ;na ule nyocha, mgbaji ahụ mere na ngwa agha a gbanwere n'ime, ọ dịghị ihe mgbaji na kọntaktị dị n'elu n'etiti ngwa agha gbanwere na ihe nkedo, nke na-egosi na ike nke njikọ dị n'etiti ngwa agha gbanwere na ihe nkedo dị ukwuu karịa nke siri ike. ngwa agha gbanwetụrụ.Otú ọ dị, mgbe ọnụ ọgụgụ nke HEMC dị ala (0% ~ 0.4%), mkpụrụ ndụ HEMC na-edozi mmiri nwere ike ikpuchi ma kechie ya na cement cement hydrated, ma mepụta ihe nkiri polymer n'etiti cement particles, nke na-eme ka mgbanwe na mgbanwe dị na ya dịkwuo elu. ngwa agha gbanwetụrụ.Plasticity, na n'ihi njigide mmiri dị mma nke HEMC, ngwa ngwa a gbanwere nwere mmiri zuru ezu maka mmeghachi omume hydration, nke na-eme ka mmepe nke ike ciment dịkwuo elu, na njikọ nke ciment ciment gbanwetụrụ na-abawanye linearly.

3.4 SEM

Site na onyonyo ntụnyere SEM tupu na mgbe cellulose ether gbanwetụrụ mortar, enwere ike ịhụ na ọdịiche dị n'etiti mkpụrụ osisi kristal na ngwa ngwa na-adịghị agbanwe agbanwe dị ntakịrị, ma na-emepụta obere kristal.N'ime ngwa agha a na-agbanwe agbanwe, kristal na-eto nke ọma, ntinye nke cellulose ether na-eme ka ọrụ njigide mmiri nke ngwa agha dịkwuo mma, ciment na-eme ka mmiri dị ọcha, na ngwaahịa hydration doro anya.

Nke a bụ n'ihi na a na-emeso cellulose ether na usoro etherification pụrụ iche, nke nwere ezigbo mgbasa ozi na njide mmiri.A na-eji nwayọọ nwayọọ na-ahapụ mmiri ahụ ogologo oge, ọ bụ naanị ntakịrị mmiri na-esi na pores capillary pụta n'ihi ihicha na evaporation, na ọtụtụ n'ime mmiri na-eji ciment hydrates iji hụ na ike nke ciment gbanwetụrụ.

4 Nkwubi okwu

a.Ka ọdịnaya nke HEMC na-abawanye, ike mkpakọ nke ngwa agha gbanwetụrụ na afọ dị iche iche na-ebelata na-aga n'ihu, na oke nke mbelata na-ebelata ma na-eme ka ọ dị larịị;mgbe ọdịnaya nke cellulose ether karịrị 0.8%, na 7d na 28d ike mkpakọ nke 3d afọ oghere sample dị ala karịa nke oghere oghere, ebe 3d-afọ mkpakọ ike nke ngwa agha gbanwetụrụ fọrọ nke nta ka efu.Ihe nlele ahụ na-agbaji mgbe a pịara ya obere, na ime ya bụ ntụ ntụ na njupụta dị ala.

b.Mgbe agbakwunyere otu ego nke cellulose ether, ike mkpakọ nke cellulose ether gbanwetụrụ ngwa agha nwere viscosities dị iche iche na-agbanwe dị ka ndị a: HEMC20HEMC10>HEMC5.

c.Ike mgbanwe nke cellulose ether modified mortar na-ebelata nke nta nke nta site na mmụba nke ọdịnaya HEMC.Mgbanwe nke ike mgbanwe nke ngwa agha gbanwetụrụ bụ: HEMC5

d.Ike njiko nke ngwa agha gbanwetụrụ na-abawanye site na mmụba nke ọdịnaya HEMC, ma jiri nwayọọ nwayọọ na-ejigidesi ike.N'otu oge ahụ, na mmụba nke ogo polymerization nke cellulose ether, mgbanwe nke njikọ ike nke ngwa agha gbanwetụrụ bụ: HEMC20>HEMC10>HEMC5.

e.Mgbe ejikọta cellulose ether n'ime ụrọ ciment, kristal na-eto n'ụzọ zuru ezu, oghere dị n'etiti ọka kristal na-ebelata, na ciment na-eme ka mmiri dị ọcha zuru oke, nke na-eme ka mkpakọ, mgbanwe na njikọ nke ụrọ ciment.